
public class RubberDuck extends Duck implements  Quackable{
	
	public void display(){
		
		System.out.println("I'm a RubberDuck.");
		
	}
	
	public void quack(){
		
		System.out.println("SKWEEK");
		
	}
	
	public void fly(){
		
		//nothing. 
		
	}
	
}
